PubMed: Hemiacetal dehydrogenation activity of alcohol dehydrogenases in Saccharomyces cerevisiae. PubMed: Ester synthesis by NAD(+)-dependent dehydrogenation of hemiacetal: production of methyl formate by cells of methylotrophic yeasts. PubMed: Purification and properties of methyl formate synthase, a mi...
This rules out coupling by a methoxy plus CHO step but leaves unresolved the possibility that the formate is produced by a hemiacetal intermediate or by formaldehyde dimerization. This lack of resolution results from isotopic scrambling caused by concurrent transesterification reactions as demonstrated ...
The kinetics were interpreted using Langmuir鈥揌inshelwood empirical models and it appears that the rate-determining step involves formation of a surface hemiacetal species, which gives a surface methoxy group and formaldehyde, by reaction with atomic hydrogen adsorbed on adjacent sites....
Suitable formaldehyde sources include, but are not limited to, aqueous formalin, anhydrous formaldehyde, formaldehyde hemiacetal, a low molecular weight polyformaldehyde (paraformaldehyde), or formaldehyde trimer (trioxane). The use of paraformaldehyde, trioxane, or anhydrous formaldehyde is preferred since ...
Formaldehyde hydrate; Formaldehyde methyl hemiacetal; Six-membered rings; Ribofuranosides.BuckleyNeilOppenheimerNormanJ.EBSCO_AspJournal of Organic Chemistry
The bioconversion of the POM and POMOM prodrugs is initiated in rate-limiting alkaline phosphatase catalyzed dephosphorylation, resulting in formation of a hydroxymethyl intermediate or a corresponding hemiacetal intermediate, which at physiological pH undergoes a rapid non-enzymatic breakdown/conversion to ...
Partial reduction of 10 with a deficient amount of triphenylphosphine gave formaldehyde hemiacetal (19) and methoxymethylhydroxymethylperoxide (20).doi:10.1139/v83-413Martin Meister, , Gerhard Zwick, and , Karl GriesbaumCanadian Journal of ChemistryMeister M., Zwick G. und Griesbaum K.: Ozonolysis...
The method of the present invention solves the batch tank process heat and mass transfer efficiency is low, high pressure reaction, side reactions, the production of low efficiency, to achieve isobutylene and formaldehyde as raw materials hemiacetal continuous production of 3-methyl-3 - buten-1-ol...
Both direct and sensitized irradiations of the endo title compound lead to a decarbony-lation product,4-isopropylbiphenyl,via Norrish Type 1 reaction,while the exo isomer gives a carbeneintermediate and subsequently formaldehyde 2-biphenylyl isopropyl hemiacetal,which in turngradually decomposes to ...
The mechanism suggested for hydrogenolysis involves formation of a surface hemiacetal species which, on cleavage of the C顥窸 bond, gives surface methoxy groups and formaldehyde. It is unclear if the slow step is this bond cleavage or the addition step which forms the intermediate. During reaction...